EP2781278B1 - Procédé de fabrication d'une canette en forme de bouteille et canette en forme de bouteille - Google Patents

Procédé de fabrication d'une canette en forme de bouteille et canette en forme de bouteille Download PDF

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Publication number
EP2781278B1
EP2781278B1 EP12850533.6A EP12850533A EP2781278B1 EP 2781278 B1 EP2781278 B1 EP 2781278B1 EP 12850533 A EP12850533 A EP 12850533A EP 2781278 B1 EP2781278 B1 EP 2781278B1
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EP
European Patent Office
Prior art keywords
container mouth
bottle
thermoplastic resin
shaped
cooling
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EP12850533.6A
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German (de)
English (en)
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EP2781278A1 (fr
EP2781278A4 (fr
Inventor
Tetsuya Takatomi
Akira Nagashima
Nobuhide SATOU
Norihisa KAWASHIMA
Shinitirou KANAMORI
Masahito ARIMA
Ayumu SATOU
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Daiwa Can Co Ltd
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Daiwa Can Co Ltd
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Publication of EP2781278A4 publication Critical patent/EP2781278A4/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/42—Details of metal walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D23/00—Details of bottles or jars not otherwise provided for
    • B65D23/02—Linings or internal coatings

Definitions

  • the present invention relates to a method for manufacturing a bottle-shaped can comprised of a can trunk, a shoulder portion and a container mouth formed integrally from a metal sheet. More particularly, the present invention relates to a manufacturing method of bottle-shaped can suitable to hold a corrosive content such as sparkling wine, and the bottle-shaped can manufactured thereby.
  • the bottle-shaped can is filled with beverage such as mineral water, sports drink, Japanese tea, black tea, Chinese tea, coffee, carbonated drink, fruit or vegetable juice, and sold in the market.
  • beverage such as mineral water, sports drink, Japanese tea, black tea, Chinese tea, coffee, carbonated drink, fruit or vegetable juice, and sold in the market.
  • the bottle-shaped can is also filled with light alcohol such as beer, sour, cocktail, and sold in the market.
  • corrosive subsulfate such as sodium sulfite is added to fermented fruit liquor such as wine for the purpose of avoiding oxidization.
  • Such antioxidant may damage an inner protective coating of the bottle-shaped can by sulfurous acid. Therefore, if the bottle-shaped can filled with wine or the like, corrosion resistance of the bottle-shaped can would be degraded thereby causing a corrosion of a metal surface of the can. In the worst case, a leakage of the content may be caused due to pitting corrosion. Thus, it is difficult to hold the content such as wine in the bottle-shaped can unless decreasing the concentration of sulfurous acid.
  • Japanese Patent Laid-Open No. 2006-264734 discloses a technique to enhance the corrosion resistance of a bottle can made of aluminum. According to the teachings of Japanese Patent Laid-Open No. 2006-264734 , an inner surface of an aluminum sheet is covered with a coating having good workability prior to forming a can, and a necking, a flanging or a threading (including a curling) are executed. Then, the inner surface is subjected to a second coating.
  • organic solvent may affect human body during or after coating, and may pollute the environment.
  • the coating since the coating has to be carried out before and after the threading, manufacturing cost of the bottle can will be raised. Therefore, it is preferable to omit the inner coating of the can body.
  • Japanese Patent Laid-Open No. 2006-62688 discloses a metal container for holding wine that is prevented from being corroded by sulfurous acid.
  • a can body is formed by drawing and ironing a metal sheet, and at least a surface of the metal sheet to be an inner face of the container is coated with a resin layer.
  • an intermediate layer of acidification agent such as calcium carbonate reacting to sulfurous acid is formed in the resin film covering the inner surface of the can.
  • JP-A-2004-224417 on which the preambles of claims 1 and 7 is based discloses amorphization of a thermoplastic resin coating layer after forming the curled portion but prior to forming a screw or the like.
  • the bottle-shaped can is filled with the content, and an aluminum closure is applied to a container mouth of the bottle-shaped can by a roll-on capping method disclosed e.g., in Japanese Patent Laid-Open No. 2001-270596 .
  • the closure is applied to the container mouth of the can, and the closure is pressed so that the resin liner is pushed tightly onto an opening end of the container mouth.
  • a thread is rolled on a cylindrical skirt of the closure by pressing a thread roller against the cylindrical skirt, and a lower end of the cylindrical skirt is tightened by pressing a tightening roller (or a lower end tightening roller) against the lower end of the cylindrical skirt.
  • the bottle-shaped can thus closed by the closure by the roll-on capping method is filled with wine having strong metal corrosive properties such as champagne or sparkling wine
  • the container mouth may be corroded by wine, and such problem has not yet been solved.
  • the bottle-shaped can is closed by a pilfer proof closure, and a pilfer proof band is detached from a lower end of the closure when the closure is unscrewed and remains around the container mouth.
  • the lower end portion of the closure is pressed by a plurality of thread rollers to be contacted onto an annular bead formed on the container mouth.
  • the annular bead may be deformed and a coating layer covering an inner surface of the annular bead may be damaged at the micro level. Therefore, the metal can body is corroded by carbon dioxide and sulfurous acid at such defective site at the micro level.
  • the bottle-shaped can made of metal is filled with wine having strong metal corrosive properties such as champagne or sparkling wine
  • the bottle-shaped can may be corroded by carbon dioxide contained in sparkling wine. Consequently, flavor of wine held in the corroded can may be deteriorated. Therefore, the bottle-shaped can has to be improved to hold such wine having strong metal corrosive properties.
  • the present invention has been conceived noting the foregoing technical problems, and it is an object of the present invention to provide a manufacturing method of a bottle-shaped can having excellent corrosion resistance and preserving properties to hold sparkling wine having strong metal corrosive properties, and a bottle-shaped can manufactured by the method of the present invention.
  • a bottle-shaped can manufacturing method comprised of: a cup shaping step of forming a cup by punching out from a metal sheet in which a thermoplastic resin coating layer is formed on at least a surface to be an inner face of the can and a lubricant is applied thereto; a can trunk shaping step of shaping the cap into a diametrically reduced bottomed cylindrical can body; a container mouth shaping step of forming a shoulder portion and a container mouth by diametrically reducing one of the end portions of the bottomed cylindrical can body; and a curling/threading/beading step of forming a curled portion on a leading end of the container mouth, and forming a thread and an annular bead on the container mouth.
  • the manufacturing method of the present invention is characterized by an amorphization step of amorphizing at least the thermoplastic resin coating layer covering an inner surface of the can body in which the curled portion, the thread and the annular bead are formed on the container mouth situated above the shoulder portion, by heating at least the thermoplastic resin coating layer covering the inner surface of the can body to above a melting point thereof, and immediately cooling the heated thermoplastic resin coating layer.
  • the container mouth shaping step includes a top dome shaping step of forming the shoulder portion and the container mouth by diametrically reducing a bottom side of the bottomed cylindrical can body, and the amorphization step includes a step of amorphizing at least the thermoplastic resin coating layer covering the inner surface of the can body in which the container mouth is opened and a bottom lid is seamed to a lower end of the can trunk on the side opposite to the container mouth.
  • the amorphization step further includes: an induction heating step of letting the can body through an induction heating apparatus while rotating the can body around an axis of the can; and a cooling step of immediately cooling the heated container mouth by immersing the container mouth into a cooling water held in a cooling tank.
  • the cooling step includes a step of cooling the container mouth by immersing the container mouth into the cooling water held in the cooling tank while orienting the container mouth downwardly; and the amorphization step includes a blowing step of blowing off the water adhering to the container mouth oriented downwardly.
  • the amorphization step further includes a cooling step of cooling container mouth of the can body conveyed in a manner to orient the container mouth downwardly, by immersing the container mouth into the cooling water held in the cooling tank while inclining a center axis of the container mouth with respect to a water surface, and thereafter pulling the container mouth out of the cooling tank while inclining the container mouth inversely to that of the case of immersing the container mouth into the cooling water.
  • the amorphization step further includes a cooling step of cooling container mouth while circulating the cooling water in the tank at a substantially same speed as a conveying speed of the can body and in the same direction as a conveying direction of the can body.
  • a bottle-shaped can that is formed from a metal sheet in which a thermoplastic resin coating layer is formed on at least a surface to be an inner face of the can.
  • a crystallinity (Cn) of the thermoplastic resin coating film covering an inner surface of a container mouth of the finished can satisfies a following inequality (1): Cn ⁇ 1
  • Cn is an infrared absorption intensity measured by IR spectroscopy method (reflection infrared spectroscopy method), which can be expressed by a following expression:
  • Cn a peak height at 1340 cm ⁇ 1 / a peak height at 1578 cm ⁇ 1 .
  • the thermoplastic resin coating layer covering an inner surface of the container mouth is subjected to an amorphization treatment to amorphize the thermoplastic resin after forming the container mouth, by heating the thermoplastic resin coating layer to above a melting point thereof, and immediately cooling the heated thermoplastic resin.
  • thermoplastic resin layer covering the inner surface of the container mouth is brought into non-orientation state by heating the container mouth locally and cooling the heated container mouth immediately before filling the bottle-shaped can with the content. Therefore, the thermoplastic resin layer is brought into non-orientation amorphous state thereby recovering defective sites of the layer at the micro level caused during forming the container mouth can be recovered.
  • elasticity and ductility of the thermoplastic resin layer can be improved. Consequently, impact resistance of the thermoplastic resin layer covering the inner surface of the can body can be enhanced at the portion contacted with a tightening roller during capping (e.g., an annular beads).
  • the bottle-shaped can according to the present invention is allowed to be filled with various kinds of contents including sparkling wine having strong metal corrosive properties.
  • the present invention is economically viable.
  • amorphization step is carried out after seaming a bottom lid to the can body, a sealing rubber of the bottom lid will not be heated to generate an offensive odor.
  • the bottle-shaped can 1 is comprised of a diametrically large cylindrical can trunk 2, a dome-shaped shoulder portion 3 having an arcuate cross-section situated above the can trunk 2, a diametrically small container mouth 4 formed integrally with the shoulder portion 3, and a bottom lid 5 seamed to a lowest end of the can trunk 2 to close an opening.
  • a desired printing design e.g., patterns and/or letters
  • a desired printing design is applied to a major part of an outer surface of the can trunk 2 including the shoulder portion 3 shadowed in Fig.1 .
  • Fig. 2 schematically shows a process for manufacturing the bottle-shaped can 1 shown in Fig. 1 having the bottom lid.
  • the bottle-shaped can 1 is formed from a metal sheet prepared by forming a thermoplastic resin coating layer in an amorphous state on both side, and applying lubricant to the coating layers (i.e., a laminated sheet).
  • a disc-shaped blank is punched out from the laminated metal sheet material at a cup shaping step.
  • the disc-shaped blank is shaped into a cup by a drawing treatment.
  • At a subsequent can trunk shaping step at least one or more times of re-drawing and an ironing are applied to the cup thereby forming a diametrically reduced bottomed cylindrical can body having a thinned can trunk.
  • an open end of the can is trimmed to a predetermined length at a trimming step.
  • the cup thus trimmed is transferred to a printing/coating step, as the customary way of manufacturing a two-piece can.
  • a desired printed decoration e.g., patterns and/or letters
  • the printed face is coated with a top coating layer, and the printed ink layer and the top coating layer are cured or dried sufficiently at a drying step.
  • the can trunk 2 of the bottomed cylindrical can is thus printed (and top coating is applied) is further transmitted to a container mouth shaping step or a top dome shaping step.
  • the bottom side corner portion (i.e., the bottom portion and the can trunk 2 near the bottom) of the bottomed cylindrical can including the printed portion of the can trunk 2 is preliminarily shaped into a curved shoulder face whose longitudinal section is arcuate, and then, of the drawing is applied to the bottom side of the can plural times to complete the shoulder portion 3 and to form the unopened container mouth 4.
  • the can thus prepared is heated by a known heating means such as a furnace and a heating oven so that at least the thermoplastic resin coating layer covering the inner surface of the can is adhered to the metal can surface.
  • a known heating means such as a furnace and a heating oven so that at least the thermoplastic resin coating layer covering the inner surface of the can is adhered to the metal can surface.
  • the leading end of the unopened container mouth 4 is cut out to be opened.
  • an open end portion 11 is curled outwardly to form an annular curled portion 12, and a thread 13 on which the closure is screwed is formed around cylindrical container mouth 4. Further, annular beads 14 and 15 are formed below the thread 13.
  • a concave bead 15 is formed by depressing the container mouth 4 radially inwardly below the thread 13, and as a result, a convex bead 14 is formed above the concave bead 15. An after-mentioned pilfer-proof band of the closure is pushed tightly onto an inclined face 14a between the beads 14 and 15.
  • a necking-in and a flanging are sequentially applied to an lower open end portion of the can trunk 2 on the opposite side of the container mouth 4.
  • a can lid seaming step a separate bottom lid made of metal is seamed to the flange portion formed on the lower opening portion of the can trunk 2 by a double-seaming method using a (not-shown) seamer (i.e., a can lid seaming machine).
  • a molding strain of the thermoplastic resin coating layer may be caused in the container mouth 4 of the can body as a result of subjecting the can body to the foregoing threading, curling, and bead forming steps. Therefore, if a the bottle-shaped can 1 is subjected to a roll-on process to push a skirt portion of the closure mounted on the container mouth 4, a coating layer covering an inner surface of the container mouth 4 may be damaged. As shown in Fig. 4 , a tightening roller of a capping apparatus is brought into contact with the concave bead 15 through a closure applied to the container mouth 4 while rolling around the container mouth 4 plurality of times to push a lower end of the closure onto the inclined face 14a.
  • the concave bead 15 is deformed inwardly and a thickness thereof is thinned.
  • capping is executed by a plurality of rollers (basically 2 to 3 rollers). Therefore, given that a thickness of the resin coated metal sheet is thinner than 0.3 mm, the concave bead 15 may be thinned while being deformed into an oval or elliptical shape. As a result, the concave bead 15 may remain deformed and a diameter of the container mouth 4 may be reduced approximately 0.1 to 0.4 mm from the original diameter.
  • thermoplastic resin coating layer (or an adhesive layer) covering the inner surface of the concave bead 15 may be thinned and weakened locally by a compression stress and a tensile strength thereby developing defects at the micro level.
  • defective sites at the micro level can be found only after storing the bottle-shaped can filled with the contents and closed by the closure for a certain period of time.
  • the bottle-shaped can 1 thus having the defects at the micro level on the thermoplastic resin coating layer will not especially be corroded even if it is filled with the contents such as soft drink including mineral water, sports drink, tea, coffee, carbonated drink and fruit or vegetable juice etc., and alcoholic beverages including beer, cocktail etc.
  • the bottle-shaped can 1 thus having the defects at the micro level on the thermoplastic resin coating layer is filled with wine having strong metal corrosive properties such as champagne or sparkling wine etc.
  • the bottle-shaped can 1 will be corroded at the defected portions of the thermoplastic resin coating layer, and flavor of the content may deteriorated by such corrosion.
  • An amount of sulfurous acid to be added to wine during fermentation is defined by Japanese food sanitation act in manner such that sulfurous acid will not remain more than 350 mg per 1 kg (i.e., 350ppm) of wine.
  • sulfurous acid has strong metal corrosive properties to corrode the metal can. Therefore in order to prevent the metal can in storage from being corroded, and to prevent flavor of the content from being deteriorated by hydrogen sulfide resulting from a reaction between sulfurous acid and the metal body, calcium carbonate has been added to a protection layer covering the inner surface of the can for the purpose of trapping sulfurous acid.
  • the protection layer Even if the protection layer has such defects at the micro level, sulfurous acid gas is captured by calcium carbonate contained in the protection layer (i.e., the thermoplastic resin layer or an adhesive layer). Therefore, the metal sheet forming the bottle-shaped can will not be corroded by still wine that does not contain carbonic acid. However, if the bottle-shaped can is filled with sparkling wine having strong metal corrosive properties, carbon dioxide is produced in addition to sulfurous acid gas. The carbon dioxide thus produced penetrates into the protection layer from the defects at the micro level and reacts to calcium carbonate in the protection layer. As a result, trapping efficiency of calcium carbonate to capture sulfurous acid gas will be degraded or deteriorated.
  • the metal sheet forming the bottle-shaped can will be corroded by both sulfurous acid gas and carbon dioxide, and flavor of sparkling wine will be deteriorated by hydrogen sulfide resulting from a reaction between sulfurous acid gas and the metal material of the bottle-shaped can.
  • the bottle-shaped can has not yet been used to hold sparkling wine.
  • the bottle-shaped can 1 for holding sparkling wine having strong metal corrosive properties is manufactured without using capturing agent such as calcium carbonate more than necessary.
  • the thermoplastic resin coating layer covering the inner surface of the bottle-shaped can 1 is heated and cooled rapidly at an inner surface of the annular beads 14 and 15 at an amorphization step to reduce crystallinity degree of the thermoplastic resin coating layer on the inner surface of the annular beads 14 and 15 to be lower than that on the inner surface of the can trunk 2.
  • Metal sheet material for the bottle-shaped can 1 is not limited to specific material.
  • a black plate, a phosphate treated steel sheet, an electrolytic chromate treated steel sheet, an aluminum sheet, a chromate treated aluminum sheet, an aluminum alloy sheet and so on are suitable for forming the bottle-shaped can 1.
  • the aluminum alloy sheet of 3004 series having a thickness of 0.2 mm to 0.32 mm is especially suitable. If the thickness of the metal sheet is thinner than 0.2 mm, buckling strength against capping pressure cannot be ensured. By contrast, if the thickness of the metal sheet is thicker than 0.32 mm, the buckling strength can be ensured sufficiently but it is too expensive.
  • the thermoplastic resin film made of polyester resin, polypropylene resin or the like can be used to form the coating layer for covering the inner surface of the can body.
  • the polyester resin includes: a homopolymer such as polyethylene terephthalate, polybutylene terephthalate, polyethylene isophthalete etc.; a copolymer prepared by mixing polyethylene terephthalate with polyethylene isophthalete; and a blending resin consisting of copolymers or consisting of the homopolymer and the copolymer.
  • the thermoplastic resin film may be formed not only into a single layer but also into a multiple layer.
  • a thickness of the resin film is preferably within a range of 10 to 50 ⁇ m.
  • the thickness of the resin film formed on the face of the metal sheet to be the inner face of the can body is determined to prevent a corrosion of the can body after subjecting the bottle-shaped can 1 to the roll-on capping. That is, if the thickness of the resin film is thinner than 10 ⁇ m, it would be difficult to ensure the corrosion resistance against the content having strong metal corrosive properties after subjecting the bottle-shaped can 1 to the roll-on capping. By contrast, if the thickness of the resin film is thicker than 50 ⁇ m, the corrosion resistance can be ensured sufficiently but it is too expensive. Therefore, the thickness of the resin film is limited within the range of 10 to 50 ⁇ m, preferably within the range of 12 to 40 ⁇ m to ensure quality of the film while justifying cost economy.
  • additives such as antioxidant, thermostabilizer, plasticizer, lubricant may be added to the resin layer.
  • the capturing agent such as calcium carbonate is added to the resin film to react to sulfurous acid contained in wine, except for a region to be contacted with a jig. Therefore, sulfurous acid contained in wine will not penetrate through the coating layer to cause a corrosion of the metal sheet forming the bottle-shaped can 1.
  • flavor of wine will not be deteriorated by hydrogen sulfide resulting from a reaction between sulfurous acid and the metal sheet.
  • an additive amount of calcium carbonate may be determined in accordance with an amount of sulfurous acid contained in wine.
  • thermoplastic resin film may be bonded directly to the metal sheet by a thermal bonding method. Otherwise, the thermoplastic resin film may be bonded directly to the metal sheet by extruding a melted thermoplastic resin in a T-die onto the preheated metal sheet. Alternatively, a preformed thermoplastic resin film may also be bonded to the metal sheet by a thermal bonding method through an adhesive primer layer, a curable adhesive layer, or a thermally adhesive thermoplastic resin layer.
  • a closure (not shown) applied to the bottle-shaped can 1 is a bottomed-cylindrical metal member comprised of a ceiling and a skirt portion.
  • the bottle-shaped can 1 is filled with the content from the container mouth 4, and the closure is applied to the container mouth 4.
  • a roll-on capping is carried out using the conventional capping apparatus while pressing the ceiling.
  • the skirt portion of the closure is threaded by a threading roller and a lower end (i.e., an opening end) of the skirt portion is tightened by a tightening roller.
  • Material of the closure is not limited to specific material, but A1100 alloy or A3105 alloy defined by JIS are especially suitable.
  • an inner face of the closure is coated with an epoxy-phenol resin or the like.
  • a resin sealing liner is affixed to the inner face of the ceiling.
  • the closure is resealable even after unscrewed, and a pilfer-proof band is attached to the lower end of the skirt portion through bridges. Therefore, the pilfer-proof band remains around the container mouth after the closure is unscrewed to proof a fact that the closure has been opened. That is, the pilfer-proof closure has a tamper-proof function.
  • the closure is applied to the container mouth 4 from above after filling the bottle-shaped can 1 with the content, and a capping pressure is applied to the ceiling of the closure. Then, a female thread is rolled on the skirt portion of the closure along with the male thread 13 of the container mouth 4 by the threading roller while pressing the ceiling. In this situation, as shown in Fig. 4 , a lower end 23 of the skirt portion 22 is pushed onto the inclined face 14a of the convex bead 14 by the tightening roller 21.
  • the annular beads 14 and 15, especially the inclined face 14a may be deformed to have an oval or elliptical cross-sectional shape or the like by a lateral load applied by the tightening roller 21.
  • the thermoplastic resin film covering the inner surface of the container mouth 4 is amorphized at the annular beads 14 and 15. Such amorphization is closely related to a capping pressure, an impact of the roller, and the lateral load. Such relation will be explained in more detail.
  • the amorphization is also carried out before the foregoing curling/threading/beading step, by heating the bottle-shaped can 1 entirely.
  • the container mouth 4 is heated locally (e.g., by high-frequency induction heating method) to amorphize the thermoplastic resin coating layer covering the inner surface of the annular beads 14 and 15. Consequently, the thermoplastic resin coating layer thus amorphized is allowed to flexibly cover the inner surface of the annular beads 14 and 15 even if the annular beads 14 and 15 are deformed into an oval or elliptical shape or even if the container mouth 14 is diametrically shrunk by the impact or lateral load of the tightening roller 21 at the roll-on capping.
  • a high-frequency induction heating device may be used to heat the container mouth 4 locally.
  • other conventional heating means such as an electric furnace, a gas oven, an infrared heating device etc. may also be used.
  • the roll-on capping can be applied to the container mouth without damaging the thermoplastic resin inner coating layer.
  • the inner surface of the bottle-shaped can 1 can be prevented from being corroded by a gaseous layer in a head space of the bottle-shaped can 1, that is, by carbon dioxide and sulfurous acid contained in sparkling wine having a high acid level (i.e., low ph level) and strong metal corrosive properties.
  • the amorphization step will be explained in more detail.
  • the annular beads 14 and 15 are heated by the high-frequency induction heating method until a temperature of the thermoplastic resin coating layer covering the inner surface of the annular beads 14, 15 is raised to a melting point thereof or higher. Consequently, the thermoplastic resin coating layer is melted at least on the inner surface of the annular beads 14, 15.
  • the bottle-shaped can 1 is turned upside down to orient the container mouth 4 downwardly to dip the container mouth 4 in the water held in a cooling tank. To this end, pure water at a temperature lower than a crystallization temperature of the thermoplastic resin is held in the cooling tank.
  • thermoplastic resin coating layer is amorphized melted at least on the inner surface of the annular beads 14, 15. Then, water adhering to the container mouth 4 is blown off by air.
  • a degree of amorphization of the thermoplastic resin film covering the inner surface of the bottle-shaped can 1 is measured by measuring a crystallinity of the thermoplastic resin film by an IR spectroscopy method (reflection infrared spectroscopy method).
  • the container mouth 4 is immersed in a hydrochloric solution of about 8 percent concentration to isolate the thermoplastic resin inner film from the inner surface of the container mouth 4. Then, absorption peak of polyethylene terephthalate is individually obtained at 1340 cm -1 and at 1578 cm -1 by measuring the crystallinity of an inner surface of the thermoplastic resin film contacted with the content by an ATR method (i.e., an attenuated total reflection method).
  • ATR method i.e., an attenuated total reflection method
  • the thermoplastic resin coating film covering the inner surface of the annular beads 14, 15 is amorphized to reduce the crystallinity (Cn) thereof to be lower than 1, as expressed by the following inequality: Cn ⁇ 1
  • the corrosion resistance of the thermoplastic resin coating film covering the inner surface of the container mouth 4 after capping can be further enhanced while maintaining the buckling strength against the capping pressure, by amorphizing the thermoplastic resin coating film in such a manner that the crystallinity (Cn) of the thermoplastic resin coating film at the inner surface of the container mouth 4 is reduced to be lower than a crystallinity (Cw) of the thermoplastic resin coating film at the inner surface of the can trunk 2, as expressed by the following inequality: Cn / Cw ⁇ 1
  • the temperature of the pure cooling water held in the cooling tank is maintained within the range from 50 to 70 °C, while circulating the cooling water.
  • Most of the microorganisms causing food intoxication are propagative within a temperature range of 10 to 37 °C therefore, in the preferred example, a temperature of the cooling water in the tank is kept to be lower than 50 °C.
  • the cooling water is allowed to be introduced easily into the container mouth 4 by lowering the container mouth 4 into the cooling water while inclining.
  • the container mouth 4 is pulled out of the water tank while being inclined inversely so that the cooling water can be introduced and discharged to/from the container mouth 4 without resistance of air.
  • the cooling water is circulated in the tank at a (substantially) same speed as the conveying speed of the bottle-shaped can 1 in the same direction as the conveying direction of the bottle-shaped can 1.
  • the resistance of the cooling water can be reduced so that the container mouth 4 is pulled out of the tank while discharging the cooling water without ruffling the cooling water in the tank. Therefore, the bottle-shaped can 1 is allowed to be conveyed stably in the cooling water held in the tank even if a weight of the bottle-shaped can 1 is light.
  • the necking and flanging of the lower end of the can trunk 2 is carried out after the curling/threading/beading steps, and then the bottom lid is seamed with the lower end of the can trunk 2. Therefore, the bottle-shaped can 1 is allowed to be held tightly from both sides without causing a deformation of the thinned can trunk 2 so that the bottle-shaped can 1 is rotated around its axis in a stable manner to heat the annular beads 14 and 15 homogeneously by the high-frequency induction heating device.
  • the container mouth 4 is inclined when lowered into the cooling water so that the cooling water is introduced smoothly into the container mouth 4 while removing air from the bottle-shaped can 1. Therefore, the container mouth 4 can be cooled rapidly.
  • the container mouth 4 is inclined inversely when pulled out of the water tank so that the cooling water is discharged smoothly from the container mouth 4 without causing a pulsation of the cooling water. Therefore, the cooling water can be removed easily from the container mouth 4.
  • the cooling water is circulated in the tank at a substantially same speed and in the same direction as those of the bottle-shaped can 1 being conveyed while being turned upside down. Therefore, the cooling water is allowed to be introduced smoothly into the container mouth 4 and the container mouth 4 is allowed to be pulled out of the tank while discharging the cooling water without ruffling the cooling water in the tank. Therefore, the bottle-shaped can 1 can be conveyed stably in the cooling water held in the tank even if a weight of the bottle-shaped can 1 is light.
  • an aluminum alloy sheet of A3004H19 series having a thickness of 0.285 mm and AB poof stress of 270 N/mm 2 was used as the metal sheet.
  • the resin film was formed on the face of the metal sheet to be the inner face of the can through an adhesive agent such as epoxy resin containing calcium carbonate.
  • the disc-shaped blank was punched out from the above-explained metal sheet covered with the polyester resin coating, and then shaped into the cup having a height of 42 mm and a diameter of 95 mm by the drawing treatment.
  • the side wall of the cup thus prepared was subjected to the drawing and ironing (total ironing rate: approx. 40 %).
  • the open end of the can was trimmed to realize a constant height, and the closure member was further shaped into a bottomed cylindrical member having a trunk diameter 59 mm and a height of 142 mm. Then, a bottom side of the bottomed cylindrical member was subjected to the top doming, and an intermediate body of the bottle-shaped can 1 having a height 174 mm was finished (the upper end had not yet opened).
  • the lubricant was removed from the intermediate body, and the intermediate body was subjected to the amorphizing treatment of the resin film. Then, a closed face of the container mouth 4 was cut off to open the container mouth 4, and the open end portion 11 of the container mouth 4 was curled outwardly to form the curled portion 12. After that, the male thread 13 to be engaged with the female thread of the closure was rolled on container mouth 4 below the curled portion 12, and the annular beads 14 and 15 were formed below the thread 13.
  • an outer diameter of the convex bead 14 was 28 mm
  • an outer diameter of the concave bead 15 was 25.9 mm
  • an inclination of the inclined face 14a was formed between the beads 14 and 15 was 45°.
  • number of ridges of the male thread 13 formed around the container mouth 4 was 8 ridges/inch.
  • the can body was then passed through a high-frequency induction heating apparatus within a short period while being rotated multiple times. Consequently, a temperature of the can body was raised to a range between 265 °C and 300 °C.
  • induction heating coils were arranged above a conveyor on both sides of the container mouth 4 of the can body at the same level to locally heat the container mouth 4.
  • a heat-resistant grip belt conveyor was used to convey the can body.
  • the belt conveyor was adapted to rotate the can body more than four times during passing the can body through the heating apparatus. Therefore, the container mouth 4 was allowed to be heated to 265 °C to 300 °C locally and homogeneously within several seconds even if conveying the can body at a speed higher than 30 m /min.
  • a radiation thermometer was arranged at an outlet of the high-frequency induction heating apparatus to measure the temperature of the can body coming out of the heating region, and a high-frequency transmitter was provided to output a measurement result (those elements not shown).
  • the system thus structured were controlled electrically so that the temperature of the can body was allowed to be raised certainly to a desired temperature even if the conveyor speed was changed.
  • an arrangement of the high-frequency induction heating apparatus may be changed flexibly to conform to a configuration of a conveying passage.
  • thermoplastic resin coating layer was amorphized at least on the inner surface of the annular beads 14, 15 so that the defects of the resin coating layer at the micro level caused during forming the container mouth 4 was recovered.
  • the bottle-shaped can 1 was finished.
  • a wall thickness of the concave bead 15 was 0.285 to 0.36 mm
  • a hardness of the concave bead 15 was Hv 84 to 88 (Hv 92 to 96, before being processed)
  • a height of the bottle-shaped can 1 was 162 mm
  • a content of the bottle-shaped can 1 was 300 ml. It was confirmed that the degree of the amorphization of the inner coating layer on the container mouth 4 was higher than that on the can trunk 2.
  • a crystallinity (Cn) of the thermoplastic resin coating layer at the inner surface of the container mouth 4 was measured, and it was 0.25.
  • a mixed resin of polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) was also used to cover the inner surface of the container mouth 4 instead of the polyethylene terephthalate resin layer.
  • a crystallinity (Cn) of the amorphized resin coating layer at the inner surface of the container mouth 4 was 0.75.
  • the crystallinities (Cn) of both resin layers at the inner surface of the container mouth 4 were less than 1.
  • the bottle-shaped can 1 thus prepared was filled with corrosion promotion liquid for sparkling wine (composition; carbonated water 270 g, ethanol 30 g, citric acid 1.5 g, potassium metabisulfite 60 mg), and a closure was applied to the container mouth 4 by the roll-on capping method, with a capping pressure of 80 kgf and a threading roller torque of 3.0 Nm.
  • the bottle-shaped can 1 thus filled with the content was stored in an upright manner for 1.3 month at room temperature of 38 °C. However, no abnormality was found on the surface of container mouth 4 (including the curled portion 12, the thread 13, and the annular beads 14 and 15) even after the storage.
  • a crystallinity (Cn) of the thermoplastic resin coating layer at the inner surface of the container mouth was 1 to approx. 1.5
  • the can container of the comparative example was also stored and assessed by the same manner. In this case, damage of the film at the inner surface of the annular beads (i.e., defects at the micro level) was not reduced even if the lateral load of the tightening roller was reduced, and a corrosion of the metal material was confirmed. On the contrary, scarcely any corrosion of the container was found if the container was not subjected to the tightening of the closure by the tightening roller.
  • a metal sheet may be selected arbitrarily from the above-explained surface treated metal sheets and steel sheets depending on the content while taking into consideration the corrosion resistance.
  • thermoplastic resin is also not limited to the blending resin.
  • copolymers such as PET, or a mixed resin consisting of the homopolymers or a mixed resin consisting of the copolymer and homopolymer may also be used.
  • the resin film covering the inner surface of the container mouth 4 is amorphized after forming the container mouth 4 as expressed by the inequality (1).
  • the crystallinity of the thermoplastic resin coating layer at the inner surface of the container mouth 4 is smaller than 1 even without amorphizing, the amorphization steps of the thermoplastic resin coating layer at the container mouth 4 may be omitted.
  • the crystallinity of the thermoplastic resin coating layer at the inner surface of the container mouth may be lowered to be smaller than 1 by adding copolymerization component to the resin composition to delay a crystallization velocity, or by blowing cooling air of low temperature compulsory to the container mouth at the heating/cooling step after forming the container mouth.
  • the amorphization steps are carried out after the can lid seaming step.
  • the amorphization steps may also be carried out after the curling/ threading/beading steps before the can lid seaming step.
  • stiffness of the can trunk 2 can be enhanced by seaming the bottom lid 5 to the can trunk 2. Therefore, the can trunk 2 will not be deformed even if held by the belts of both sides while being rotated by running those belts in opposite directions when heating the container mouth 4. That is, the container mouth 4 can be heated homogeneously by the high-frequency induction heating apparatus.
  • the container mouth 4 including the curled portion 12, the thread 13, and the annular beads 14 and 15 is allowed to be heated entirely.
  • the thermoplastic resin on the container mouth 4 is damaged most seriously at the portion other than the annular beads 14 and 15 within the region contacted with leading end of the roller at the roll-on capping. Therefore, it is desirable to amorphize the thermoplastic resin film by heating only the annular beads 14, 15 and vicinity thereof to prevent the can trunk 2 from being thinned excessively and to prevent the thermoplastic resin film from being weakened by the thermal history.
  • the container mouth 4 may be cooled not only by being immersed in the cooling water as described in the preferred example but also by blowing the cooling water or cooling air thereto.
  • the present invention is applied to the bottle-shaped can in which the bottom lid is seamed to the lower end of the can trunk.
  • the present invention may also be applied to a can body in which the shoulder portion and the container mouth are formed by diametrically reducing an open end side of the cylindrical can body, and in which the can trunk and the bottom lid are formed integrally (i.e., to a monoblock type can body).
  • a manufacturing method taught by an international publication WO01/015829 is suitable for manufacturing a bottle-shaped can having an elongated container mouth. Therefore, flexibility in the shape of the can may be improved by using the manufacturing method taught by an international publication WO01/015829 , in comparison with a case of forming the monoblock type by the conventional method.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Claims (8)

  1. Procédé de fabrication de boite en forme de bouteille (1), comprenant :
    une étape de formation d'une coupe consistant à former une coupe par poinçonnage d'une tôle dans laquelle une couche de revêtement en résine thermoplastique est formée sur au moins une surface destinée à être la surface intérieure de la boite (1) et l'application d'un lubrifiant à celle-ci ;
    une étape de formation d'un corps de boite (2) consistant à transformer la coupe en un corps de boite cylindrique diamétralement réduite présentant un fond ;
    une étape de formation d'une embouchure de conteneur (4) consistant à former une partie formant épaule (3) et une embouchure de conteneur (4) par le biais d'une réduction diamétrale d'une des parties d'extrémité du corps de boite cylindrique présentant un fond ; et
    une étape de formation d'un rebord/filetage/bourrelet consistant à former une partie roulée (12) sur un bord d'attaque de l'embouchure du conteneur (4), et à former un filetage et un bourrelet annulaire intérieur (14, 15) sur l'embouchure du conteneur (4) ;
    une étape d'amorphisation faisant suite à l'étape de formation d'un rebord/filetage/bourrelet ;
    l'étape d'amorphisation étant caractérisée par : l'amorphisation d'au moins la couche de revêtement en résine thermoplastique recouvrant une surface intérieure du corps de boite (1) dans lequel la partie roulée (12), le filetage (13) et le bourrelet annulaire (14, 15) sont formés au niveau de l'embouchure du conteneur (4) au-dessus de la partie formant épaule (3), en chauffant au moins la couche de revêtement en résine thermoplastique recouvrant la surface intérieure du corps de boite (1) à une température supérieure au point de fusion de la résine thermoplastique, suivi d'un refroidissement immédiat de la couche de revêtement en résine thermoplastique.
  2. Procédé de fabrication de boite en forme de bouteille (1) selon la revendication 1, selon lequel l'étape de formation de l'embouchure du conteneur comporte une étape de formation d'un dôme de dessus consistant à former la partie en forme d'épaule (3) et l'embouchure du conteneur (4) en réduisant diamétralement un côté inférieur du corps cylindrique de boite présentant un fond ; et
    selon lequel l'étape d'amorphisation comporte une étape d'amorphisation d'au moins la couche de revêtement en résine thermoplastique recouvrant la surface intérieure du corps de boite (1) dans lequel l'embouchure du conteneur (4) est ouverte (4) et un couvercle de fond (5) est fixé par formation de joint à une extrémité inférieure du corps de boite (2) du côté opposé à l'embouchure du conteneur (4).
  3. Procédé de fabrication de boite en forme de bouteille (1) selon la revendication 1 ou la revendication 2, selon lequel l'étape d'amorphisation comporte :
    une étape de chauffage par induction consistant à faire passer le corps de boite (1) à travers un dispositif de chauffe à induction tout en faisant tourner le corps de boite (1) autour d'un axe de la boite ; et
    une étape de refroidissement consistant à refroidir immédiatement l'embouchure de conteneur chauffée (4) en immergeant l'embouchure du conteneur (4) dans de l'eau de refroidissement stockée dans une cuve de refroidissement.
  4. Procédé de fabrication de boite en forme de bouteille (1) selon la revendication 3, selon lequel l'étape de refroidissement comporte une étape de refroidissement de l'embouchure du conteneur (4) en immergeant l'embouchure du conteneur (4) dans l'eau de refroidissement stockée dans la cuve de refroidissement tout en orientant l'embouchure du conteneur (4) vers le bas ; et
    selon lequel l'étape d'amorphisation comporte une étape de soufflage consistant à souffler l'eau résiduelle adhérant encore à l'embouchure du conteneur (4) orientée vers le bas.
  5. Procédé de fabrication de boite en forme de bouteille (1) selon la revendication 3 ou la revendication 4, selon lequel l'étape d'amorphisation comporte une étape de refroidissement consistant à refroidir l'embouchure du conteneur (4) du corps de boite (1) transporté d'une façon à orienter l'embouchure du conteneur (4) vers le bas, en immergeant l'embouchure du conteneur (4) dans l'eau de refroidissement stockée dans la cuve de refroidissement tout en inclinant un axe central de l'embouchure du conteneur (4) par rapport à une surface de l'eau, et
    par la suite, en retirant l'embouchure du conteneur (4) de la cuve de refroidissement tout en inclinant l'embouchure du conteneur (4) dans un sens inverse à celui de l'inclinaison pendant l'immersion de l'embouchure du conteneur (4) dans l'eau de refroidissement.
  6. Procédé de fabrication de boite en forme de bouteille (1) selon l'une quelconque des revendications 3 à 5, selon lequel l'étape d'amorphisation comporte une étape de refroidissement consistant à refroidir l'embouchure du conteneur (4) tout en faisant circuler l'eau de refroidissement dans la cuve à une vitesse sensiblement égale à celle à laquelle on transporte le corps de boite (1) et sensiblement dans la même direction que celle dans laquelle on transporte le corps de boite (1).
  7. Boite en forme de bouteille (1), formée à partir d'une tôle dans laquelle une couche de revêtement en résine thermoplastique est formée sur au moins une surface destinée à devenir une surface intérieure de la boite, la boite comprenant un corps de boite (2) composé d'un corps cylindrique de boite muni d'un fond et présentant une partie d'extrémité diamétralement réduite, la partie d'extrémité diamétralement réduite comprenant une partie formant épaule (3) et une embouchure de conteneur (4) située au-dessus de la partie formant épaule (3), l'embouchure de conteneur (4) comprenant une partie roulée (12) sur l'extrémité d'attaque de l'embouchure de conteneur (4), un filetage (13) et un bourrelet annulaire (14,15), la boite étant caractérisée en ce que :
    une cristallinité (Cn) de la couche de revêtement en résine thermoplastique recouvrant une surface intérieure de l'embouchure de conteneur (4) de la boite finie est vérifiée selon l'inégalité suivante (1) : Cn < 1
    Figure imgb0016
    où Cn est une intensité d'absorption infrarouge mesurée par une méthode de spectroscopie en infrarouge, la méthode dite de spectroscopie en infrarouge par réflexion, qui est exprimée par une expression suivante : Cn = une hauteur de pic à 1340 cm − 1 / une hauteur de pic à 1578 cm − 1 ;
    Figure imgb0017
     et
    une relation entre la cristallinité (Cn) de la couche de revêtement en résine thermoplastique au niveau de la surface intérieure de l'embouchure de conteneur (4) de la boite finie, et une cristallinité (Cw) de la couche de revêtement en résine thermoplastique au niveau d'une surface intérieure du corps de la boite (2) est vérifiée selon l'inégalité suivante : Cn / Cw < 1
    Figure imgb0018
    où Cw est une intensité d'absorption infrarouge mesurée par une méthode de spectroscopie en infrarouge, la méthode dite de spectroscopie en infrarouge par réflexion, qui est exprimée par une expression suivante : Cw = une hauteur de pic à 1340 cm − 1 / une hauteur de pic à 1578 cm − 1 .
    Figure imgb0019
  8. Boite en forme de bouteille (1) selon la revendication 7, selon laquelle la couche de revêtement en résine thermoplastique recouvrant une surface intérieure de l'embouchure de conteneur (4) est rendue amorphe du fait du traitement d'amorphisation pour rendre amorphe la résine thermoplastique après la formation de l'embouchure de conteneur (4), en chauffant la couche de revêtement en résine thermoplastique à une température supérieure au point de fusion de la résine, suivi d'un refroidissement immédiat de la résine thermoplastique chauffée.
EP12850533.6A 2011-11-18 2012-11-16 Procédé de fabrication d'une canette en forme de bouteille et canette en forme de bouteille Active EP2781278B1 (fr)

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PCT/JP2012/079733 WO2013073647A1 (fr) 2011-11-18 2012-11-16 Procédé de fabrication d'une canette en forme de bouteille et canette en forme de bouteille

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JP2013107093A (ja) 2013-06-06
EP2781278A4 (fr) 2015-07-15

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